Plow.



No. 757,120. Y PATENTBD APR. 12, 1904.

J. B. JARMIN.

PLOW. APPLITION FILED DEO- 2| 1903. H0 HODHL.

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No. 757,120. PATBNTBD APR. 12, 1904. J. B. JARMIN.

PLOW.

ARPLIOATION FILED DEO. 2. 1003.

N0 MODEL.

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PATENTBD APR. 12, 1904.:

`J. B. JARMIN.

PLOW.

APPLIoATIoN FILED DBO. 2. 190s.

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N0 MODEL.

No. 757,120. PATBNTED APR. 12, 1904.-l

, 1 .1. B. JARMIN.

PLOW.

APPLICATION FILED DEO. 3, 1903.

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8 SHEETS-SHEET 5.

.4 o 9 1 2 l R P A D E T N E T A P PLOW.

APPLIOATION FILED no. 2, 190s.

J. B. JARMIN.-

`N0 MODEL.

PATENTED APR. 12, 1904.

J. -B. JARMN.

PLOW.

APrLIoATIoN FILED Imc. z. 190s.

8 SEEETSBEEET 6.

' N0 MODEL.

Nu-757,120. PATENTED APR.12, 1904. J. B. JARMIN.

PLOW.

APPLIoA'rIoN FILED DEQ. z. 190s. No MODEL. s sums-sunset 7.

PATENTED APR. 12, 1904. J. B.'JARMIN. PLOW.

Arrmonron mun Dnc. 2. 1903.

8 SHEETS-SHEET 8.

I0 MODEL.

s, UNITED STATES* Patented April 12, 19045 PATENT OFFICE.

PLow COMPANY, 'or

WISCONSIN.

MADISON, WISCONSIN, A CORPORATION OF PLOW.

SPECIFICATION forming part of Letters Patent N o. 757,1520, dated April 12, 1904. Appncation med December 2,1903. serial No. 183,540. (No model.)

To all whom, it may concern: i

Be it known that I, JAMES B. JARMIN, a citizen of the United States. residing at Madison, I

in the county `of Dane and State of Wisconsin, have invented certain new and useful Improvements in Flows, of which the following is a specification. p

My invention relates to improvements in riding-plows.

Among the objects of my invention are the following: First, to provide a plow which will quickly descend oint first to any predetermined depth, will automatically level itself at that depth, and will rise point first when the plow is lifted from the furrow,` -thereby providing a plow which will produce a furrow of full depth for substantially its entire length; second, to provide a plow which is so iieXibly mounted in its frame that it will automatically rise over obstructions, such as stones, and following the upper surface of the obstruction will immediately and automatically return to its plowing depth; third, to provide such a plow which at the will of the operator may beY held locked at a given depth until released by the action of the operator; fourth, to provide simple and` effective means for adjusting'such a plow forany desired depth of furrow, and, fifth, to provide a mounting for the plow s o constructedthatv vsharp corners may be turned while the plow is ,at work without any tendency to upset the plow. These and such other objects as may hereinafter appear are attained by the devices illustrated in the accompanying drawings, in which- Figure 1 is a view of the landsideof the plow, the plow being shown in its raised po-V sition and the wheels running on level ground. Fig. 2 shows the position occupied by the parts as the plow descends point first to the bottom of the furrow. Fig.4 3 shows the position of the parts after the plow has auto- Y matically leveled itself at the bottom of the furrow. Fig. A shows the position occupied by the parts as the plow starts to rise point.

first either when being lifted from the furrow by the operator or when automatically lifting itself over an obstruction. Fig. 5 is a plan view. Fig. 6 is a detail of the plow-operating apparatus, showing the parts in the position Aassumed when the plow is at its highest po- 4is at the bottom of a furrow. Fig. 8 is a plan view of a detail of the depth-gage device.

Fig. 9 isa side elevation thereof. Fig. 10 is a detail of the upset-preventing device. Fig. 11 is a detail of a modified bail. Fig. 12 is a detail of a modication of the plow-tilting apparatus. Fig. 13 is a detail of the plowlocking device. Fig. 14 is a detail in elevation of the bail and the bearing-casting. Fig. 15 is another view of the same. Fig. 16 is a detail of another modified form of the apparatus for controlling the heel of the plow, and Fig. 17 is a detail of thetrip-yoke.

Like figures and letters of reference indicate the same parts in the several figures of the drawings.

Referring to the accompanying drawings, lis the main frame of the plow, shown in the form of a parallelogram comprising the sides A B and ends C D. The end C is provided with a familiar form of yoke arranged in the usual manner to permit vertical play of the-plowbeam. The frame 1 is supported, by means of bearing-heads 2 and 3, upon the bent axles of the furrow-wheels A and 5, respectively, and is also supported in a manner hereinafter described by the land-wheel 6.

Secured to the sides A B, respectively, are downwardly-extending brackets 7 and 8, which provide journal-bearings for the main shaft 9. The shaft 9 is journaled at one end directly in the bracket 8, is bent between the sides A B of the frame to form a bail 10, extends through a casting l1, which casting is journaled in the bracket 7, thence through a filling-piece 12, and through a sleeve E, formed on a casting 13, to a segmental rack 11,which is rigidly secured to the landside end of the shaft 9. The casting 13 comprises a sleeve E, through which the shaft 9 extends, a sleeve F, which is rotatively mounted upon the axle of the land-wheel 6, and arms which rigidly connect the sleeves E and F with each other. Only one of said arms is shown, the other being hidden, in the drawings, behind the leveling mechanism. Suitably and rigidly secured to another arm of the casting 13 is the leveler arm or lever 15, upon which is reciprocatingly mounted a spring-pressed dog 16, which is normally held in engagement with the teeth of the segmental rack 14 by a spring 17.

The casting 11 comprises a segmental rack G, extending upwardly from acylindrical portion H, which serves to keep the rack G properly spaced from the inner face of the bracket 7. One end of the cylindrical portion H affords an annular shoulder which abuts against the inner face of the bracket 7 and leads to a smaller cylindrical portion I, which is journaled within the bracket 7. Beyond the bearing within the bracket 7 the casting 11 is again reduced to va still smaller cylindrical portion J, which is provided with an integral rib or key K. Mounted upon the portion J is a sleeve 18, which is provided with a keyway which tits snugly over the rib or key K. The sleeve 18 comprises an arm L and oppositely disposed lugs. M and N. Pivotally mounted upon the arm L isa lever 19, provided at one end with an inwardly-extending lip. This lipl normally engages Ia vertical 'shoulder formed upon a rib O upon the outer face of the bracket 7. rlhe lip upon the lever y19 is held in engagement with said shoulder,

by a-spring 20, which is secured at one end to the lever 19 and yat its opposite end to the lug N.

Pivoted to the lug M is a foot-lever 21, comprising duplicate arms secured together so as to provide a space therebetweemwithin which space one arm of the lever 19 plays. Extending across this space is a pin P, which engages a slot in the upper edge of said arm of the lever 19, said slot having an inclined or camfaced wall extending toward the outer end of `sai d arm. Q isa cross-pin carried by said arm of the lever 19 and extending in the path of the foot-lever 21. It will thus be seen that when the foot-lever 21 is moved in a forward and downward `direction the pin P engaging the cam-face of the slot inthe lever 19 will depress that end of the lever 19 and will thereby raise the lip end of the lever out of engagement with the shoulder upon the bracket 7. The further travel of the lever 21 will bring it in engagement with the cross-pin Q, whereupon the cross-pin, now acting as a link between the lever 21 and the arm L upon the sleeve 18, will rotate the sleeve 18 in a forward direction, and by reason of the keyed connection of the sleeve 18 with the casting 11 j the casting 11 and all of its parts will be correspondingly moved.

Extending from the inner end of the castlng 11 is a pair of integral clamping-arms 7L,

which are arranged eccentrically to the axis f the cylindrical portion H and which are clamped around that part of the shaft 9 which is bent to form one arm of the bail 10. Consequently the bail 10 moves in unison with the casting 11.

22 is a second foot-lever which is rigidly secured to a bracket 23, said bracket being rotatively mounted upon a bearing 211, arranged uponl the side A'of the frame 1 and forwardly from the bracket 7. The segmental rack G is connected with the lower end of the lever 22 by a link 25,which is pivoted to the lower end of the lever 22 and is also pivoted to the rack G at a point above its lower end. It will thus be seen that the forward and downward movement of the free end of the lever 22 will cause the backward rotation of the vrack G and connected parts, including the bail 10, until the lip upon the lever 19 is snapped by the spring 20 back into engagement with the shoulder upon the rib O. By this arrangement of levers the bail 10 may be raised or lowered by the feet of the rider as the rider sits in the seat 26, which is mounted upon the frame 1, leaving the hands of the operator free.

The plow-beam 27 is pivotally mounted upon the bail 10 by means of brackets 28, which arev clamped to the plow-beam and extending downwardly therefrom are journaled upon the bail 10. Connected at one end with one of the brackets 28 and extending backwardly to an adjusting-rod 29, which is secured to a lug upon the end D of the 'frame 1, is a powerful spring30. It will thus be seen that the lowering of the plow by the depression of the lever 21 is assisted by the weight of the plow, the descent of which puts the spring 30 under tension, so that the reverse operation produced by the depression of the lever 22 is assisted by the contraction of the spring 30, which assists in lifting the weight of the plow.

The 'bracket 7 lextends over the upper edge of the side A of the frame 1 and is provided with a shoulder b, which extends beyond the inner'face of the side A and in the path of an arm 31. This arm 31 is pivotally mounted `upon the inner face of the rack G and carries a spring-pressed dog which engages the teeth of the rack G in a familiar manner, said dog being connected by a rod with a handle 32, by means of which the dog may be lifted out of engagement with the rack G and held out of engagement while the arm 31 is moved upon its pivotto anyl desired position, whereupon the handle 32 being released the dog locks the arm 31 in its new position, so that when the arm 31 is brought by the operation of the machine into contact with the stop I) said stop serves as a stop to the movement of the rack Gr, and so of course acts efectively as a stop to limit the travel ofall parts which are rigidly connected with the rack Gr. As I may thus limit the forward and downward movement of the bail 10, and so of the plow-beam IOO IIO

hand the depth of the furrow. If it be de-v sired to lock the plow in position at the bottom of the furrow, this result may be attained by means of a dog 33, which is pivotally mounted upon the bracket 7 in such a position that it may be swung upon its pivot into position directly behind the arm 31 when the arm 3l is resting against the stop thereby effectively preventing the reverse movement of the arm 31 and connected parts.

Secured to the plow-beam 27 behind the brackets 28 is an adjustable clip 34, formed of duplicate sides, between the bases of which the plow-beam is clamped. -From their bases these sides extend upwardly and outwardly to form an arm R, to which is movably connected a link 35. This link 35 is slotted at its upper end. Extending across the space between the sides of the clip 34 and. through the slot in the link 35 is a pin 36. The lower end of the link 35 is pivoted to the lower end of a casting 37. 38 is another link which is pivoted to the casting 37, but at a point above and behind the pivotal engagement therewith of the link 35. The upper end of the link 38 normally rests under the extreme end of the arms of the clip 34 and is held in that position by a shoulder S. It will thus be seen that the rear of the plowbeamis supported when the parts are in the position shown .in Figrl by the link 35 and the casting 37. It will also be noticed that in this position the arms 35 and 38 diverge upwardly from each other. Another point to be noted is that the arms of the bail 1() are shorter than the link 35 and the link 38 and that in the position shown in Fig. 1 the arms of the bail 10 stand in a position much closer tothe vertical than either the links 35 or 38. As a result of this arrangement the operation of the mechanism is as follows: As the lever 21 is depressed the arms of the bail l0 travel forwardly and downwardly over a much larger segment of a circle than that described'in the same time by either the link 35 or the link 38. The result of this is, first, 4 to carry the beam 27 forwardly with relation to the arm 35, so that the pin 36 is lifted out of engagement with the bottom of the slot in the link 35 and the weight of the rear of the plow is supported by the link 38. At the same time the forward end of the plow-beam is carried in a downward direction much more rapidly than the rear end, which is supported first by the link 35 and then by the link 38, and 'consequently the point of the plow4 is depressed, as shown in Fig. 2, and the plow descends forwardly and downwardly, with av marked depression of the point of the plow. So, also, the end of the arm of the clip 34 approaches the link 35.

39 is a yoke which is adjustably clamped to the link 35 by means of a set-screw 40. This in Fig. 2 is determined by the longitudinal' adjustment of the yoke 39 upon the link 35. Consequently as the end of the arm of the clip 34 approaches the link 35 with the downward movement of the plow-beam the distance between the links 35 38 is correspondingly lesscned until the link 38 is brought in contact with the bottom of said slot, which acts as a stop to the further movement of the link 38 in this direction, so that the continuedrelative downward movement of the arm on fthe clip 34 will disengage the end of said arm from the upper end of the link 38, whereupon the rear of the plow being deprived of the support of,

the link 38 will drop until the pin 36 rests upon the bottom of the slot in the link 35. The yoke 39 is so adjusted that this tripping action will occur when the point of the plow has reached its position at the bottom of the furrow, and the length of the slot is such that this lost motion will make up for the difference in the previous relative downward travel of the point and the heel of the plow, so that the'heel of the plow will overtake the point and the plow will restflevel or as nearly level as is desired. It-will thus beseen that the location of the clip 34 upon the plow-beam 27 will determine to what extent, if at all, the heel of the plow in plowing position shall be above the point. As it is desirable to vary this position according to the nature of the soil being plowed in order to overcome friction, suction, &c., the clip 34 is made adjustable with relation to the plow-beam 27. When now the lever 22 is depressed, thereby elevating the bail 10, it will be seen that the rear of the plow is pivotally mounted upon the upper end of the link 35 and is carried by said link. The bail 10 will begin to rise when its arms are lying much closer to a horizontal plane than the link 35. Consequently the bail lO will travel upward more rapidly than the outer end of the link 35, with the result that the forward end of the plow-beam will be elevated more rapidly than the rear end, the point of the plow will be correspondingly elevated, and the plow will rise out of the ground point first, thereby enabling it to cut its way from the bottom of the furrow to the surface of the ground. When the bail 10, however, has passed its maximum upward speed and has reached a point where it vis traveling more rapidly backward, the link 35 will be rising at a speed which is more rapid than the ,upward movement at the same time of the bail 10, so that while the bail 10 is accelerating the backward travel of the plow-beam the link 35 will be accelerating the upward travel of the rear end of the plow-beam, with the result that as the parts reach their elevated position, as

IOO

y limited play to the plowwith relation to itsv shown in Fig. l, the heel of the plow will have overtaken the point of the plow, so to speak, and thev point and heel willonce more hang level. At the same time there will be va relative rotation of the plow-beam and the `clip 34 upon the pin 36 as a center, with the.

result that the end ofthe arm of the clip 34 Iwill be carried continually farther away from the link 35 until the space between the end of said arm and the pivot. upon which the lower kend of the arm 38 is mounted will have beby this arrangement attain the results above set forth, but I also produce a plow having a floating mount in its frame so arranged-that `as the plow encounters a stone the plow may 4swing-1n its mounting, so as to permit the point of the plow to be elevated by the stone,

so that .the plow will risewithin its frame.

point first and with heel ydepressed `without bringing any lifting strainto `bear upon the,- plow-frame.4 The plow-point will be de' pressed as soon as the apex of the stone passing `under the plow elevates the heel of the plow, -and thereupon the plow will promptly descend -point first to the bottom of the furrow, where it will automatically level itself once more. -this manner I take from the plow all that strain which is incidental to those structures in which -the plow cannot pass overa stone without `lifting the carriage-frame in whole orin part, and by my mounting, which permits the plow toV ,automatically rise point first and descend point rst,-the, plow cuts its way upward, thereby avoiding the strain incident to tearing it upwardly while the plow remains in a level posi- Y tion, and notonly so, but the plow will cut its way upward and thence down again to the bottom of the ground immediately adjacent to the surface of the stone, so that the continuity of the furrow is not materially affected except as thefurrow is obstructed by the bulk of the stone.

by the plow in reaching the bottomof vthe furrow after passing the stone.` If after the plow reaches the bottom of a furrow it is locked in position byvmeans of the dog 33, as

4previously described, the plow is still free to swing to a limite'd extent upon the bail 10, because of the slottedengagement between the clip 34 and the link 35. This allowsV a carriage or frame, so that the plow may accommodate itself to any slight irregularities There is` no consider-y able section of ground which 1s passed over which the wheels, especially the land-wheel,

may encounter. Y

One principal defect in sulky-plows is that .in turning to the right the rear furrow-wheel .will cramp against the land side of the furrow at a time when the forward furrowwheel is turned wholly or partly under the plow, and will thusforce the plow-carriage over and will upset the plow, oftentimes with considerable consequent damage in addition tothe inconvenience. Itis well known that this is a very frequent happening with sulkyplows. As commonly constructed, the furrowwheels arey mountedv upon bentaxles arranged eccentrically to the bearing-heads in a peculiar but well-known manner, and the vertical portions of the bent axles, whichextend through the bearing 'heads, are connected with each other by means lof leverarms and a connecting-rod, the lever-arm of the forward furrow-wheel being connected with the vpole to which the horses are hitched, all in such a manner that when the forward furrow-wheel is swung to the right the rear furrow-wheel will be pulled to the left. It will thus be -seen inasmuch as the rear furrow-wheel normally runs vin such a manner as to. abut against the land side of the furrow ,that this turning of the forward furrow-wheel .will cramp the rear` wheel against the land Vsidev of the furrow, with a resulting tendency to .uset the plow.

I overcome this serious defeet without interfering with the necessary relative operation' of the forward and rear furrow wheels in the following manner: Clampedto theA upright end vof thebent axle of the rearfurrow-wheel 5 is a lever-arm 41,

while simi-larlypsecured to the upright end of the bent axle. of the forward furrow-wheel 4 is a lever-arm 42. -Attached to the lever-arm 41 and extending forwardly is a rod 43, which `pivotally engages a slot 44' in the lever-arm 142..; This slot 44 extends alongy the lever- `arm 42 transversely of the carriage and diagonal ly to the axis ofthe machine, as shown. Secured in the usual way to the lever-arm 42 is roi the pole-arm 45,which is clamped to the pole of the machine. When in turning to the right the .furrow-wheel 4 is turned 'to the right, the furrow-wheel 5 will be cramped against the vertical land side of the furrow in which it isrunning. With my arrangement, instead of causing 'the furrow-wheel 5 to vpush against the land side of the furrow, the resistance of thev Afurrow-wheel 5 will cause the lever-arm 42 to 'of the furrow. It is well understood in this art that the furrow-wheels are so mounted that their constant tendency is to swing to Vmove along the line of least resistance and will promptly resume its original position at the outer end of the slot 44. In turning to the left the rear furrow-wheel will be held from turning by the land side of the furrow, the forward end of the rod 43 meanwhile sliding toward the inner end of the slot 44, the forward furrow-wheel being meanwhile free to turn squarely around the corner. The continued forward movement of the plow will cause the rear furrow-wheel to follow, and as it clears the first furrow and resumes its straight position the rod 43 will again return to the outer end of the slot 44.

In Figs. 11, 12, and 16 I have shown three different modifications of the arrangement for getting the differential movement of the heel of the plow with relation to the point of the p ow.

In Fig. 16 I have shown a clip 34' secured to the plow-beam and provided with a slot, within which plays a pin 36', carrying a pair of links 35', only one of which is'shown secured thereto upon opposite sides of the clip 34'. The lower ends of these links are pivoted to the lower ends of a casting 37 Pivoted to the outer end of the arm upon the clip 34' is a link 38', which in raised position rests upon a shoulder extending across the bottom of the slot in the casting 37', said shoulder being above and behind 37 to which the links 35' are pivoted. EX- tending between the links 35' is a lug carrying a screw 40', which serves as a stop to trip the. link 38' out of engagement with the shoulder on the casting 37' when in the descent of the plow the links 38 and 35' reach a predetermined distance from eachother.

In the modification shown in Fig. 12 I have shown a clip 342 mounted upon the plow-beam and carrying a pair of links 352, only one of which is shown, which are pivoted to said clip upon opposite sides thereof and which are provided at their lower ends with slots which engage a pin 362, projecting from the opposite sides of a casting 372. Pivoted to the outer end of the arm upon the clip 342 is a link 382, which engages a shoulder upon the casting 372 and is tripped therefrom in substantially the same manner as described in the last modification.

In the modification shown in Fig. 11 the principal variation from the modification shown in Fig. 1'6, above described, is the substitution of a bail 352, the transverseportion the end of the castingv of which extends through 34', so that the bail takes 36' and the links 35';

the slot in the clip the place of the pin but in this modication the lower ends of the bail are journaled in brackets 45', which are secured to and extend below the sides A and B of the frame 1.

While I have described in detail the preferred embodiment of my invention, and while I have also described some of the more obvious modifications thereof, it will be understood that my invention is not limited to any of the embodiments thereof shown or described, but may be embodied in various other ways without departing from the spirit thereof, especially so long as the plow is so mounted that the heel of the plow both in its initial downward and upward travel moves more slowly than the point of the plow, so that the plow descends into and rises out of the ground point first, provision being also made for allowing the heel of the plow in its downward travel to overtake the point of the plow, so that as the point of the plow approaches the predetermined plowing depth the heel o'f the plow will also descend to proper plowing position.

I claimv 1. In a plow, mechanism for putting the plow into the ground point downward, for au-.-

tomatically leveling the plow at a predetermined depth, for raising the plow out ofthe ground point Erst and for automatically ad` s f i justing it in position for rentering the ground,

said mechanism 'comprising a support pivotally connected with the forward part of the plow-beam and a plurality of rear supports connected with the plow-beam, one of said rearsupports having a lost-motion connection at one end, and the other of said rear supports being arranged to be alternately thrown into and out of operation.

2.V The combination in a sulky-plow, of a support pivotally connected with the forward part of the plow-beam and carried by the structure, of a support also carried by the structure, pivotally connected with the rear portion of the plow-beam and having a lostmotion connection at one end, a third support, means arranged to automatically throw said third support out of operation as a support at a certain stage in the descent of the plow, and for resetting the same into supporting position at a'stage in the raising of the plow, and means for raising and lowering the plow, all so arranged rthat the initial movement of the plow-point upwardly and downwardly will be more rapid than the movement of the heel of the plow, thereby causing the plow to descend point first into the ground and to rise point first out of the ground.

3. The combination with a frame, of a plow, a pair of arms, pivotally connected with said frame, having a pivotal connection with said plow and arranged to support the plow in the frame, supporting means comprising a link IOO IIO

ISO

pivotally connected with the plow and with the frame, behind said arms, one of said connections being a slotted connection, and a second link extending from the frame to the plow and having rocking bearings at each end, and means, operated by the movement of the plow to plowing position, whereby said lastnamed link is tripped from one of its bearings.

4. The combination with a frame, of a bail pivotally mounted therein, a plow carried by said bail, a pair of link-arms, of greater length than the arms of said bail, arranged, to alternately support the plow, within said frame and behind said bail, and means operated by the descent of the plow to plowing position, whereby one of said arms is tripped out of supporting'position and the rear of the plow drops until it is supported by the other of said arms.

' 5. The combination with a frame, of a bail pivotally mounted therein, a plow pivotally carried by said bail, a link of greater length than the arms of said bail, pivotally secured at one end to said frame and at'the other end to said plow behind said bail, one of said con- Y nections being a slotted connection, a second rocking link also longer than the bail-arms and extending between the frame and a portion of the plow structure,lall so arranged that the rear of the plow will be suppOrted by the last-named link as the plow moves downwardly, and means interposed in the path of the last-named link for tripping it out of supporting position as the point of the plow approaches plowing position.

6. rlhe combination with a frame, of a bail pivotally supported thereby, a plow pivotally supported by said bail, an arm extending from the plow-beam back of said bail, a pin carried by said arm, a link having slotted engagement with said pin and of greater length than the bail-arms, said link being pivotally supported at its lower end by a part of the structure, mounted therein, means for lowering the plow and a second link of greater length than the bail-arms, said link extending from a iixed point on the structure to a bearing-surface of the arm carried by the plow-beam, having a rocking bearing at each end and diverging from said first-named link, all so arranged that the last-named link will support the rear of the'plow as the plow descends, and means interposed between said links whereby said lastnamed link is tripped out of supporting position whenever the plow descends to a predetermined point.

7. The combination with a frame, of a plow, a pivotal support for the front part of the plow, a pair of differential supports for' the back part of the plow, all so arranged that the plow will descend point iirst into the' ground, and means actuated by the descent of the plow whereby the weight of the back part of the plow will be automatically shifted from one to the other of said diierential supports as the plow reaches Va predetermined depth,

whereby the plow will automatically level itself after descending point first into the ground.

8. The combination with a frame, of a plow, means moving in the arc 'of a circle for supporting the forward end of the plow within said frame, a plurality of supports moving in the arc of a larger circle than said iirst-named means, for supporting the back part of the plow within said frame, one of said last-named supports having a slotted engagement with a part of the structure between the frame and the plow, and a device whereby upon the descent of the plow to a predetermined depth the weight of the back part of the plow is automatically shifted from one of said last-named supports to the slotted supporting device.

9. The combination with a frame, of a plow, a bail carrying the plow and journaled within the frame, a segmental rack pivotally supported in the frame and arranged to move in unison with the bail, an arm movably mounted on said rack, means for lockingsaid arm in different positions upon said rack, and a stop interposed in the path of said arm.

l0. The combination with aframe, of a plow carried thereby, means for raising and lowering the plow in said frame, an arm mounted to move in unison with said plow-operating means, mechanism for locking said arm in a plurality of positions, and a stop interposed in the path followed by said arm during the lowering of the plow.

11. The combination with a frame, of a plow carried thereby, means for lowering the plow in said frame, a segmental rack arranged to be rocked by the operation of said plow-lowering means, a movable arm mounted upon said rack, I means for locking said arm at different posig tions on the periphery of said rack, and a stop interposed in the path described by said arm during the descent of the plow.

12. The combination witha frame, of a plow in said frame, a segmental rack arranged to be moved by said plow-lowermg means and arranged to be swung on lts axis thereby, an

` arm pivoted to said rack, a spring-pressed dog carried by said arm and arranged to engage the teeth of said rack so as to lock the arm inV any adjusted position on said rack, and a stop interposed in the path described by said arm during the descent of the plow.

13; The combination with a frame, of a bail journaled thereto, a plow pivotally supported by said bail, a segmental rack connected with said bail so as to move in unison therewith and upon their common axis, an arm pivotedv to the rack, a spring-pressed dog carried by the arm and arranged to engage the teeth of the rack, and a stop carried by the frame and arranged in the path described by the arm during the downward movement of the plow.

14. The combination with a plow-frame, of a pair of brackets carried thereby, a sleeve IOO IIO

journaled in one of said brackets, a stop earried on said sleeve, means, Carried by the frame, for engaging said stop, a plow-carrying bail, journaled at one end in one of said braak ets and extending at the opposite side of the frame through the sleeve and rigidly secured to said sleeve, a foot-lever journaled to the frame, operative connections between said Vfoot-lever and said sleeve, whereby the sleeve may be rotated upon its axis by the operation of said lever, a second sleeve rigidly secured to said first-named sleeve,a second operatinglever, and operative connections between said second lever and said second-named sleeve,

JAMES B. J ARMIN Witnesses:

JAMES P. CoRRY, JACKSON REUTER. 

